Merge tag 'xtensa-next-20130508' of git://github.com/czankel/xtensa-linux

Pull xtensa updates from Chris Zankel:
 "Support for the latest MMU architecture that allows for a larger
  accessible memory region, and various bug-fixes"

* tag 'xtensa-next-20130508' of git://github.com/czankel/xtensa-linux:
  xtensa: Switch to asm-generic/linkage.h
  xtensa: fix redboot load address
  xtensa: ISS: fix timer_lock usage in rs_open
  xtensa: disable IRQs while IRQ handler is running
  xtensa: enable lockdep support
  xtensa: fix arch_irqs_disabled_flags implementation
  xtensa: add irq flags trace support
  xtensa: provide custom CALLER_ADDR* implementations
  xtensa: add stacktrace support
  xtensa: clean up stpill_registers
  xtensa: don't use a7 in simcalls
  xtensa: don't attempt to use unconfigured timers
  xtensa: provide default platform_pcibios_init implementation
  xtensa: remove KCORE_ELF again
  xtensa: document MMUv3 setup sequence
  xtensa: add MMU v3 support
  xtensa: fix ibreakenable register update
  xtensa: fix oprofile building as module

9 files changed, 314 insertions, 24 deletions

diff --git a/arch/xtensa/include/asm/Kbuild b/arch/xtensa/include/asm/Kbuild
index 095f0a2244f7..1b982641ec35 100644
--- a/arch/xtensa/include/asm/Kbuild
+++ b/arch/xtensa/include/asm/Kbuild
@@ -15,6 +15,7 @@ generic-y += irq_regs.h
 generic-y += kdebug.h
 generic-y += kmap_types.h
 generic-y += kvm_para.h
+generic-y += linkage.h
 generic-y += local.h
 generic-y += local64.h
 generic-y += percpu.h
diff --git a/arch/xtensa/include/asm/ftrace.h b/arch/xtensa/include/asm/ftrace.h
index 40a8c178f10d..36dc7a684397 100644
--- a/arch/xtensa/include/asm/ftrace.h
+++ b/arch/xtensa/include/asm/ftrace.h
@@ -1 +1,33 @@
-/* empty */
+/*
+ * arch/xtensa/include/asm/ftrace.h
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2013 Tensilica Inc.
+ */
+#ifndef _XTENSA_FTRACE_H
+#define _XTENSA_FTRACE_H
+
+#include <asm/processor.h>
+
+#define HAVE_ARCH_CALLER_ADDR
+#define CALLER_ADDR0 ({ unsigned long a0, a1; \
+		__asm__ __volatile__ ( \
+			"mov %0, a0\n" \
+			"mov %1, a1\n" \
+			: "=r"(a0), "=r"(a1) : : ); \
+		MAKE_PC_FROM_RA(a0, a1); })
+#ifdef CONFIG_FRAME_POINTER
+extern unsigned long return_address(unsigned level);
+#define CALLER_ADDR1 return_address(1)
+#define CALLER_ADDR2 return_address(2)
+#define CALLER_ADDR3 return_address(3)
+#else
+#define CALLER_ADDR1 (0)
+#define CALLER_ADDR2 (0)
+#define CALLER_ADDR3 (0)
+#endif
+
+#endif /* _XTENSA_FTRACE_H */
diff --git a/arch/xtensa/include/asm/initialize_mmu.h b/arch/xtensa/include/asm/initialize_mmu.h
index e1f8ba4061ed..722553f17db3 100644
--- a/arch/xtensa/include/asm/initialize_mmu.h
+++ b/arch/xtensa/include/asm/initialize_mmu.h
@@ -23,6 +23,9 @@
 #ifndef _XTENSA_INITIALIZE_MMU_H
 #define _XTENSA_INITIALIZE_MMU_H
 
+#include <asm/pgtable.h>
+#include <asm/vectors.h>
+
 #ifdef __ASSEMBLY__
 
 #define XTENSA_HWVERSION_RC_2009_0 230000
@@ -48,6 +51,110 @@
 	 * (XCHAL_HW_MIN_VERSION >= XTENSA_HWVERSION_RC_2009_0)
 	 */
 
+#if defined(CONFIG_MMU) && XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY
+/*
+ * Have MMU v3
+ */
+
+#if !XCHAL_HAVE_VECBASE
+# error "MMU v3 requires reloc vectors"
+#endif
+
+	movi	a1, 0
+	_call0	1f
+	_j	2f
+
+	.align	4
+1:	movi	a2, 0x10000000
+	movi	a3, 0x18000000
+	add	a2, a2, a0
+9:	bgeu	a2, a3, 9b	/* PC is out of the expected range */
+
+	/* Step 1: invalidate mapping at 0x40000000..0x5FFFFFFF. */
+
+	movi	a2, 0x40000006
+	idtlb	a2
+	iitlb	a2
+	isync
+
+	/* Step 2: map 0x40000000..0x47FFFFFF to paddr containing this code
+	 * and jump to the new mapping.
+	 */
+#define CA_BYPASS	(_PAGE_CA_BYPASS | _PAGE_HW_WRITE | _PAGE_HW_EXEC)
+#define CA_WRITEBACK	(_PAGE_CA_WB     | _PAGE_HW_WRITE | _PAGE_HW_EXEC)
+
+	srli	a3, a0, 27
+	slli	a3, a3, 27
+	addi	a3, a3, CA_BYPASS
+	addi	a7, a2, -1
+	wdtlb	a3, a7
+	witlb	a3, a7
+	isync
+
+	slli	a4, a0, 5
+	srli	a4, a4, 5
+	addi	a5, a2, -6
+	add	a4, a4, a5
+	jx	a4
+
+	/* Step 3: unmap everything other than current area.
+	 *	   Start at 0x60000000, wrap around, and end with 0x20000000
+	 */
+2:	movi	a4, 0x20000000
+	add	a5, a2, a4
+3:	idtlb	a5
+	iitlb	a5
+	add	a5, a5, a4
+	bne	a5, a2, 3b
+
+	/* Step 4: Setup MMU with the old V2 mappings. */
+	movi	a6, 0x01000000
+	wsr	a6, ITLBCFG
+	wsr	a6, DTLBCFG
+	isync
+
+	movi	a5, 0xd0000005
+	movi	a4, CA_WRITEBACK
+	wdtlb	a4, a5
+	witlb	a4, a5
+
+	movi	a5, 0xd8000005
+	movi	a4, CA_BYPASS
+	wdtlb	a4, a5
+	witlb	a4, a5
+
+	movi	a5, 0xe0000006
+	movi	a4, 0xf0000000 + CA_WRITEBACK
+	wdtlb	a4, a5
+	witlb	a4, a5
+
+	movi	a5, 0xf0000006
+	movi	a4, 0xf0000000 + CA_BYPASS
+	wdtlb	a4, a5
+	witlb	a4, a5
+
+	isync
+
+	/* Jump to self, using MMU v2 mappings. */
+	movi	a4, 1f
+	jx	a4
+
+1:
+	movi    a2, VECBASE_RESET_VADDR
+	wsr	a2, vecbase
+
+	/* Step 5: remove temporary mapping. */
+	idtlb	a7
+	iitlb	a7
+	isync
+
+	movi	a0, 0
+	wsr	a0, ptevaddr
+	rsync
+
+#endif /* defined(CONFIG_MMU) && XCHAL_HAVE_PTP_MMU &&
+	  XCHAL_HAVE_SPANNING_WAY */
+
 	.endm
 
 #endif /*__ASSEMBLY__*/
diff --git a/arch/xtensa/include/asm/irqflags.h b/arch/xtensa/include/asm/irqflags.h
index f865b1c1eae4..ea36674c6ec5 100644
--- a/arch/xtensa/include/asm/irqflags.h
+++ b/arch/xtensa/include/asm/irqflags.h
@@ -47,7 +47,10 @@ static inline void arch_local_irq_restore(unsigned long flags)
 
 static inline bool arch_irqs_disabled_flags(unsigned long flags)
 {
-	return (flags & 0xf) != 0;
+#if XCHAL_EXCM_LEVEL < LOCKLEVEL || (1 << PS_EXCM_BIT) < LOCKLEVEL
+#error "XCHAL_EXCM_LEVEL and 1<<PS_EXCM_BIT must be no less than LOCKLEVEL"
+#endif
+	return (flags & (PS_INTLEVEL_MASK | (1 << PS_EXCM_BIT))) >= LOCKLEVEL;
 }
 
 static inline bool arch_irqs_disabled(void)
diff --git a/arch/xtensa/include/asm/linkage.h b/arch/xtensa/include/asm/linkage.h
deleted file mode 100644
index bf2128a99d79..000000000000
--- a/arch/xtensa/include/asm/linkage.h
+++ /dev/null
@@ -1,16 +0,0 @@
-/*
- * include/asm-xtensa/linkage.h
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 2001 - 2005 Tensilica Inc.
- */
-
-#ifndef _XTENSA_LINKAGE_H
-#define _XTENSA_LINKAGE_H
-
-/* Nothing to do here ... */
-
-#endif	/* _XTENSA_LINKAGE_H */
diff --git a/arch/xtensa/include/asm/stacktrace.h b/arch/xtensa/include/asm/stacktrace.h
new file mode 100644
index 000000000000..6a05fcb0a20d
--- /dev/null
+++ b/arch/xtensa/include/asm/stacktrace.h
@@ -0,0 +1,36 @@
+/*
+ * arch/xtensa/include/asm/stacktrace.h
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2001 - 2013 Tensilica Inc.
+ */
+#ifndef _XTENSA_STACKTRACE_H
+#define _XTENSA_STACKTRACE_H
+
+#include <linux/sched.h>
+
+struct stackframe {
+	unsigned long pc;
+	unsigned long sp;
+};
+
+static __always_inline unsigned long *stack_pointer(struct task_struct *task)
+{
+	unsigned long *sp;
+
+	if (!task || task == current)
+		__asm__ __volatile__ ("mov %0, a1\n" : "=a"(sp));
+	else
+		sp = (unsigned long *)task->thread.sp;
+
+	return sp;
+}
+
+void walk_stackframe(unsigned long *sp,
+		int (*fn)(struct stackframe *frame, void *data),
+		void *data);
+
+#endif /* _XTENSA_STACKTRACE_H */
diff --git a/arch/xtensa/include/asm/timex.h b/arch/xtensa/include/asm/timex.h
index 9e85ce8bd8dd..3d35e5d0367e 100644
--- a/arch/xtensa/include/asm/timex.h
+++ b/arch/xtensa/include/asm/timex.h
@@ -19,13 +19,16 @@
 #define _INTLEVEL(x)	XCHAL_INT ## x ## _LEVEL
 #define INTLEVEL(x)	_INTLEVEL(x)
 
-#if INTLEVEL(XCHAL_TIMER0_INTERRUPT) <= XCHAL_EXCM_LEVEL
+#if XCHAL_NUM_TIMERS > 0 && \
+	INTLEVEL(XCHAL_TIMER0_INTERRUPT) <= XCHAL_EXCM_LEVEL
 # define LINUX_TIMER     0
 # define LINUX_TIMER_INT XCHAL_TIMER0_INTERRUPT
-#elif INTLEVEL(XCHAL_TIMER1_INTERRUPT) <= XCHAL_EXCM_LEVEL
+#elif XCHAL_NUM_TIMERS > 1 && \
+	INTLEVEL(XCHAL_TIMER1_INTERRUPT) <= XCHAL_EXCM_LEVEL
 # define LINUX_TIMER     1
 # define LINUX_TIMER_INT XCHAL_TIMER1_INTERRUPT
-#elif INTLEVEL(XCHAL_TIMER2_INTERRUPT) <= XCHAL_EXCM_LEVEL
+#elif XCHAL_NUM_TIMERS > 2 && \
+	INTLEVEL(XCHAL_TIMER2_INTERRUPT) <= XCHAL_EXCM_LEVEL
 # define LINUX_TIMER     2
 # define LINUX_TIMER_INT XCHAL_TIMER2_INTERRUPT
 #else
diff --git a/arch/xtensa/include/asm/traps.h b/arch/xtensa/include/asm/traps.h
index b5464ef3cf66..917488a0ab00 100644
--- a/arch/xtensa/include/asm/traps.h
+++ b/arch/xtensa/include/asm/traps.h
@@ -22,10 +22,9 @@ extern void do_unhandled(struct pt_regs *regs, unsigned long exccause);
 
 static inline void spill_registers(void)
 {
-	unsigned int a0, ps;
 
 	__asm__ __volatile__ (
-		"movi	a14, " __stringify(PS_EXCM_BIT | LOCKLEVEL) "\n\t"
+		"movi	a14, "__stringify((1 << PS_EXCM_BIT) | LOCKLEVEL)"\n\t"
 		"mov	a12, a0\n\t"
 		"rsr	a13, sar\n\t"
 		"xsr	a14, ps\n\t"
@@ -35,7 +34,7 @@ static inline void spill_registers(void)
 		"mov	a0, a12\n\t"
 		"wsr	a13, sar\n\t"
 		"wsr	a14, ps\n\t"
-		: : "a" (&a0), "a" (&ps)
+		: :
 #if defined(CONFIG_FRAME_POINTER)
 		: "a2", "a3", "a4",       "a11", "a12", "a13", "a14", "a15",
 #else
diff --git a/arch/xtensa/include/asm/vectors.h b/arch/xtensa/include/asm/vectors.h
new file mode 100644
index 000000000000..c52b656d0310
--- /dev/null
+++ b/arch/xtensa/include/asm/vectors.h
@@ -0,0 +1,125 @@
+/*
+ * arch/xtensa/include/asm/xchal_vaddr_remap.h
+ *
+ * Xtensa macros for MMU V3 Support. Deals with re-mapping the Virtual
+ * Memory Addresses from "Virtual == Physical" to their prevvious V2 MMU
+ * mappings (KSEG at 0xD0000000 and KIO at 0XF0000000).
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2008 - 2012 Tensilica Inc.
+ *
+ * Pete Delaney <piet@tensilica.com>
+ * Marc Gauthier <marc@tensilica.com
+ */
+
+#ifndef _XTENSA_VECTORS_H
+#define _XTENSA_VECTORS_H
+
+#include <variant/core.h>
+
+#if defined(CONFIG_MMU)
+
+/* Will Become VECBASE */
+#define VIRTUAL_MEMORY_ADDRESS		0xD0000000
+
+/* Image Virtual Start Address */
+#define KERNELOFFSET			0xD0003000
+
+#if defined(XCHAL_HAVE_PTP_MMU) && XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY
+  /* MMU v3  - XCHAL_HAVE_PTP_MMU  == 1 */
+  #define PHYSICAL_MEMORY_ADDRESS	0x00000000
+  #define LOAD_MEMORY_ADDRESS		0x00003000
+#else
+  /* MMU V2 -  XCHAL_HAVE_PTP_MMU  == 0 */
+  #define PHYSICAL_MEMORY_ADDRESS	0xD0000000
+  #define LOAD_MEMORY_ADDRESS		0xD0003000
+#endif
+
+#else /* !defined(CONFIG_MMU) */
+  /* MMU Not being used - Virtual == Physical */
+
+  /* VECBASE */
+  #define VIRTUAL_MEMORY_ADDRESS	0x00002000
+
+  /* Location of the start of the kernel text, _start */
+  #define KERNELOFFSET			0x00003000
+  #define PHYSICAL_MEMORY_ADDRESS	0x00000000
+
+  /* Loaded just above possibly live vectors */
+  #define LOAD_MEMORY_ADDRESS		0x00003000
+
+#endif /* CONFIG_MMU */
+
+#define XC_VADDR(offset)		(VIRTUAL_MEMORY_ADDRESS  + offset)
+#define XC_PADDR(offset)		(PHYSICAL_MEMORY_ADDRESS + offset)
+
+/* Used to set VECBASE register */
+#define VECBASE_RESET_VADDR		VIRTUAL_MEMORY_ADDRESS
+
+#define RESET_VECTOR_VECOFS		(XCHAL_RESET_VECTOR_VADDR - \
+						VECBASE_RESET_VADDR)
+#define RESET_VECTOR_VADDR		XC_VADDR(RESET_VECTOR_VECOFS)
+
+#define RESET_VECTOR1_VECOFS		(XCHAL_RESET_VECTOR1_VADDR - \
+						VECBASE_RESET_VADDR)
+#define RESET_VECTOR1_VADDR		XC_VADDR(RESET_VECTOR1_VECOFS)
+
+#if XCHAL_HAVE_VECBASE
+
+#define USER_VECTOR_VADDR		XC_VADDR(XCHAL_USER_VECOFS)
+#define KERNEL_VECTOR_VADDR		XC_VADDR(XCHAL_KERNEL_VECOFS)
+#define DOUBLEEXC_VECTOR_VADDR		XC_VADDR(XCHAL_DOUBLEEXC_VECOFS)
+#define WINDOW_VECTORS_VADDR		XC_VADDR(XCHAL_WINDOW_OF4_VECOFS)
+#define INTLEVEL2_VECTOR_VADDR		XC_VADDR(XCHAL_INTLEVEL2_VECOFS)
+#define INTLEVEL3_VECTOR_VADDR		XC_VADDR(XCHAL_INTLEVEL3_VECOFS)
+#define INTLEVEL4_VECTOR_VADDR		XC_VADDR(XCHAL_INTLEVEL4_VECOFS)
+#define INTLEVEL5_VECTOR_VADDR		XC_VADDR(XCHAL_INTLEVEL5_VECOFS)
+#define INTLEVEL6_VECTOR_VADDR		XC_VADDR(XCHAL_INTLEVEL6_VECOFS)
+
+#define DEBUG_VECTOR_VADDR		XC_VADDR(XCHAL_DEBUG_VECOFS)
+
+#undef  XCHAL_NMI_VECTOR_VADDR
+#define XCHAL_NMI_VECTOR_VADDR		XC_VADDR(XCHAL_NMI_VECOFS)
+
+#undef  XCHAL_INTLEVEL7_VECTOR_VADDR
+#define XCHAL_INTLEVEL7_VECTOR_VADDR	XC_VADDR(XCHAL_INTLEVEL7_VECOFS)
+
+/*
+ * These XCHAL_* #defines from varian/core.h
+ * are not valid to use with V3 MMU. Non-XCHAL
+ * constants are defined above and should be used.
+ */
+#undef  XCHAL_VECBASE_RESET_VADDR
+#undef  XCHAL_RESET_VECTOR0_VADDR
+#undef  XCHAL_USER_VECTOR_VADDR
+#undef  XCHAL_KERNEL_VECTOR_VADDR
+#undef  XCHAL_DOUBLEEXC_VECTOR_VADDR
+#undef  XCHAL_WINDOW_VECTORS_VADDR
+#undef  XCHAL_INTLEVEL2_VECTOR_VADDR
+#undef  XCHAL_INTLEVEL3_VECTOR_VADDR
+#undef  XCHAL_INTLEVEL4_VECTOR_VADDR
+#undef  XCHAL_INTLEVEL5_VECTOR_VADDR
+#undef  XCHAL_INTLEVEL6_VECTOR_VADDR
+#undef  XCHAL_DEBUG_VECTOR_VADDR
+#undef  XCHAL_NMI_VECTOR_VADDR
+#undef  XCHAL_INTLEVEL7_VECTOR_VADDR
+
+#else
+
+#define USER_VECTOR_VADDR		XCHAL_USER_VECTOR_VADDR
+#define KERNEL_VECTOR_VADDR		XCHAL_KERNEL_VECTOR_VADDR
+#define DOUBLEEXC_VECTOR_VADDR		XCHAL_DOUBLEEXC_VECTOR_VADDR
+#define WINDOW_VECTORS_VADDR		XCHAL_WINDOW_VECTORS_VADDR
+#define INTLEVEL2_VECTOR_VADDR		XCHAL_INTLEVEL2_VECTOR_VADDR
+#define INTLEVEL3_VECTOR_VADDR		XCHAL_INTLEVEL3_VECTOR_VADDR
+#define INTLEVEL4_VECTOR_VADDR		XCHAL_INTLEVEL4_VECTOR_VADDR
+#define INTLEVEL5_VECTOR_VADDR		XCHAL_INTLEVEL5_VECTOR_VADDR
+#define INTLEVEL6_VECTOR_VADDR		XCHAL_INTLEVEL6_VECTOR_VADDR
+#define DEBUG_VECTOR_VADDR		XCHAL_DEBUG_VECTOR_VADDR
+
+#endif
+
+#endif /* _XTENSA_VECTORS_H */